Java does not support the concept of Pointers. Pointers are inherently tricky and troublesome to use.

Java does not support multiple inheritance because it causes more problem s than it solves. Instead Java supports multiple interface inheritance.

Java does not use structures and unions because the traditional data structures are implemented as an object oriented framework( Java Collection Framework ).

All the codes are encapsulated with in a class there fore java does not have a global variables or functions.

C++ requires explicit memory management, while java includes automatic garbage collection.

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